Large power grid disturbance propagation characteristic evaluation method

Abstract

The invention provides a large power grid disturbance propagation characteristic evaluation method. According to the method, energy conveying evolution characteristics and disturbance track large power grid disturbance propagation characteristics are combined for evaluation; firstly, according to the transient total energy change characteristics after the fault, the disturbance propagation process after the fault is divided into a transient energy injection stage, a transient energy conservation stage and a transient energy step-by-step attenuation stage; then, an evaluation object is determined according to the transient energy change characteristics in each stage; a time-domain simulation method is used for simulation calculation; in addition, relevant items of the transient energy are selected from the simulation result in different stages, and are defined as an observation index; influence factors for generating the disturbance are judged; an influence factor set is generated, so that the key factors for influencing the transient energy propagation are obtained; the evaluation of the large power grid disturbance propagation characteristics is realized.

Description

technical field [0001] The invention relates to the technical field of power system control and simulation analysis, in particular to a method for evaluating the disturbance propagation characteristics of a large power grid. Background technique [0002] At present, my country's power grid construction has entered the era of UHV large power grid. As the scale of the power grid continues to expand, while it plays a role in optimizing the allocation of resources, it also expands the scope of faults, which may lead to large-scale power outages and even grid collapse across the country. new challenge. Studying the propagation process of large power grid disturbances is of great significance for understanding the behavior characteristics of power systems after disturbances and formulating relevant prevention and control measures. [0003] The current research methods for the disturbance propagation characteristics of large power grids mainly include the disturbance trajectory m...

AI Technical Summary

Problems solved by technology

However, when using the transient energy function method to study the transient stability of the system, there are also two key difficulties that limit its application: 1) How to construct a transient energy function that reflects the system stability; 2) Which method to use Determine the critical energy of the system

[0004] The above evaluation methods for the disturbance propagation characteristics of large power grids are all based on energy analysis and trajectory analysis, and the whole process of transient energy evolution after a fault is uniformly analyzed without distinction; Insufficient, and the latter cannot give a stability margin; it makes the analysis difficult, and at the same time it is difficult to solve the problems of each stage

In addition, many indicators for evaluating energy transfer and transmission have been proposed in the energy function correlation method, but these indicators are generally constructed directly from the perspective of energy, and it is difficult to establish a direct connection with the time-domain simulation results obtained by the trajectory method. The amount of calculation is large and the conversion steps are complicated, which greatly limits the wide application of this type of index in the actual large power grid

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